The reason mixing sorcerer and wizard in dnd5e is a questionable decision is the attribute requirements: Wizards have their spell success tied to INT, and sorcerers to CHA. Having high scores in both is usually not possible, especially since you need DEX and CON for survival, so mixing the classes would lead to some spells failing more times...
Also, you will get higher level spells later - you need 5 levels in one of the classes to start getting level 3 spells, 7 levels in one of the classes to get access to level 4 spells etc. A dual-classed char will always be behind.
Pure sorcerers are really nice with their powerful metamagic options - twinned spells in particular can give you a great value per action and per spell slot used, and they get access to most wizard spells.
The important advantage of wizards is that they can scribe spells from scrolls to their spellbook, giving you many choices. Since scrolls you'll find are limited, it would make sense to have just one wizard in your party. If you plan on recruiting Gale, it'd make sense to give him the scrolls to scribe, and be the sorcerer yourself. Alternatively, just play as the origin character of Gale for a nice in depth magic related story.
Another advantage Wizards get is being able to cast spells as a ritual, without spending a spell slot. I haven't seen any use to rituals in BG3 EA I think, as there was no need to identify items.
Being a power-obsessed villain in my opinion works perfectly well with either Sorcerer or Wizard.
Last edited by Tottenheim; 01/08/23 10:03 PM.
